Means for cleaning casings



Patented Dec. 18, 1928.

UNITED 'STATES GEORGE D. WATSON, OF TORRANCE, CALIFORNIA.

MEANS FOR CLEANING CASINGS.

I Application filed May 26,

This invention relates to means for cleaning casing, and particularly perforatedv casing. This invention contemplates an improvement upon my pending application for Y means and method of cleaning perforated casing, filed in the United States Patent Ofiice November 16, 1925, Serial No. 69,324.

It is customary to first bale a well before cleaning the perforations in the casing after which a device such as that about to be described, or a device like the one referred to in my above pending-application for patent is then lowered within the well casing and oil, either hot or cold, and in fact, some times water, is conducted to said device through a tubing which rapidly turns a rotor and. sprays the inner surface of the screening under liquid pressure to properly clean such perforations of paraflin or other accumulated material that may close such perforations. The present device, however, is useful in that often times it is required that the screening or perforated casing be removed from the a well hole, and if the screening or casing has 2 become frozen it is very difficult to remove the casing. After the well has been baled, the device about to be described is lowered within the well casing, and due to the eccentric form of the rotor the same will ar the casing and particularly the screening or perforated part, back and forth. within the well hole, and thus loosen the casing so that such plasiing may be readily removed from the well With t e above ,and other objects in view, including simplicity in operation, ease of use, the invention consists in the novel and useful provision, formation, construction, association and relative arrangement of parts, memhere and features, all as further shown in certain embodiments in the accompanying drawing, described generally, and more particularly pointed out in claims.

In the drawing: K

Figure 1 is an elevation of my improved device;

Figure 2 is a vertical sectional View of the device shown in Figure 1. and likewise showing the device within casing; and,

Figure 3 is a transverse sectional view on the line 33 of Figure 1.

Corresponding parts in all the figures are designated by the same reference characters.

Referringwith particularity to the drawing, the improved device is designated as an 1926. Serial No. 111,711.

entirety and in one embodiment by A, and a perforated casing to be cleaned, by B.

' The device A includes a rotor (1 adapted to be confined between a box I) and a head 0. The box 6 is flanged at 1 and provided with a co hollow shaft 2, which hollow shaft is headed as at 3. The box is provided with the usual screw-threaded socket 4, and likewise such box is screw-threaded externally, as shown at 5. The head 0 is conical in form, being provided with a curved periphery'6, and said head is centrally bored and screw-threaded at 7. The head is. likewise provided upon its base portion 8 with a ball-bearing race 9, the race being concentric with the axis of said head.

The rotor at is preferably formed of bronze as it has been found that extra bearing surfaces are not necessary for this metal when used in conjunction with steel. Furthermore, packing glands adapted to hold oil are likewise not necessary, which makes the device simple as to construction. This rotor may be cast so as to have a smooth curved outer surface 10 which is eccentric to the inner surface or bore 10 of such rotor. The inner surface of the rotor is provided with a series of longitudinally extending vanes 11 of saw-toothed formation, as shown in the drawings. During'the casting of the rotor the said rotor is provided with top and bottom inwardly directed flanges 12 and 13 respectively, and which flanges are bored as shown at 1-4 and 15 so that the rotor may fit upon the shaft 2. The inner bore of the rotor is concentric with the said shaft 2 and the outer curved surface of the rotor is eccentric to said shaft 2. However, the outer surface 10 of the rotor has that portion of greatest radius of a-radius not greater than the radius of the box- I) or the radius of the base of the head 0.

The shaft 2 is provided with a vertically ascendingseries of bores 16 which are substantially tangent to the bore of the shaft, and the said rotor is provided with aseries of Ion transverse bores 17 which are at an angle to one of the faces of each of the saw-toothed vanes. As many'of the bores 16 and 17 may be provided as use and service would require. However, I have preferably arranged such 10:)

- bores so thatthere is a vertical ascending series, certain groups of which lie in the same transverse plane. The device may be assembled by screw-threading the head of the shaft for screw-threaded engagement with the threads 7 of the head '0, and in such a manner that anti-friction means such as roller bear 'tion relative to the shaft by passing a pin 20 through aligned openings in the head and the shaft.

The device A is connected to tubing at the box portion and the tubing runs to the surface of the well. If for some reason it is desired,

particularly in a new well, to remove the screening or liner as it is sometimes called, from the well hole, and it so happens that such liner is stuck-within the formation, the device A is lowered within such well casing and when fluid vsuch as water, oil or other substances is forced through the tubing to the device A, the rotor is rapidly rotated and will jar against the liner or screening and tend to loosen the liner or screening from the well formation so that the casing may be removed. It is of course realized that during this operation the fluid forced into the device A is in turn being forced outwardly through the openings 17 of the rotor for impingement against the inner surface of the casing.

It is obvious that various changes and modifications may be made in practicing the invention, in departure'from the particular showing, Without departing from the true spirit of the invention. v

Having thus disclosed my invention; I

claim and desire to secure by Letters Patent: 1. In a well cleaning device, a box formed with a hollow shaft, said hollow shaft being provided with transverse openings, a head carried by said shaft, and a rotor mounted upon said shaft, said rotor being formed with transverse openings and whereby when fluid is forced into said hollow shaft, said fluid is projected inwardly of the rotor to turn the same and likewise escape through the transverse" openings in the rotor, said'rotor having an eccentric rotation relative to the said shaft. i

2. In a Well cleaning device, a box formed with a shaft, saidbox being provided with a flange, a head carried by the shaft, a rotor upon said shaft between the flange of the box and said head, the peripheral surface of said rotor being curved eccentrically relative to said shaft, and the maximum radius of said curved periphery lying in substantial alignment with the the head.

In testimony whereof I have] signed my periphery of the flange and of name to this specification.

GEORGE n. WATSON. 

